Patent US3860503A successfully refreshed from Google Patents.
US3860503A
Expired / Lapsed
US
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Method for forming a colored coating on aluminous materials
Assignee: Riken Light Metal Industry Co Ltd
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Filing: 1972-07-27
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Granted: 1975-01-14
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Expires: 1992-07-27
Abstract
Abstract Colored oxide coatings from yellow to brown on aluminum or aluminum alloy are formed by an anodic oxidation with an aqueous solution of 0.5 - 10.0 percent by weight of oxalic acid and 0.05 - 4.0 percent by weight of an ammonium salt, a metal acetate or a metal nitrate.
Inventors
- 👤 Masashi Ikegaya
- 👤 Fumio Shigeta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:50
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A method as claimed in claim 1, wherein said acetate is selected from the group consisting Of manganese acetate and chromium acetate.
Claim 2
Dependent Claim
23 words
A method as claimed in claim 1, wherein said metal nitrate is selected from the group consisting of ferric nitrate and chromium nitrate.
Claim 3
Independent Claim
114 words
A method of producing colored oxide coatings ranging from yellow to brown on aluminum or aluminum alloy, which consists essentially of electrolytically anodizing with direct current, an aluminum material selected from the group consisting of aluminum and an alloy thereof in an aqueous solution of 0.5 - 10.0 percent by weight of oxalic acid and 0.05 - 4.0 percent by weight of a salt selected from the group consisting of ammonium phosphate, ammonium dichromate, manganese acetate, chromium acetate, ferric nitrate and chromium nitrate at a temperature of between 0* and 50*C; a voltage of between 5-160 volts, a current density of between 0.05 - 5 A/dm2, and for a time of between 10-120 minutes.
Claim 4
Dependent Claim
21 words
A method as claimed in claim 4, wherein the amount of said ammonium salt is 0.05 - 4.0 percent by weight.
Claim 5
Dependent Claim
20 words
A method as claimed in claim 1, wherein the amount of said acetate is 0.05 - 1.5 percent by weight.
Claim 6
Dependent Claim
21 words
A method as claimed in claim 4, wherein the amount of said metal nitrate is 0.05 - 0.7 percent by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |